1972 chrysler LM318 cooling

[circle hook]

should there be a little {faint} amount of steam coming out the exhaust, I just replaced the raw water impellers & have plenty of water flow. and I pressure tested the closed anti freeze side & no leaks. but that steam bothers me. it all ways was since I bought the boat did this but I am wondering if it is ok or not. oh and for gauges I am in the process of changing them as they are 43 years old and I don't really trust them & my next move also is to buy one of those lazer thermometer.and check the block that way too. THANKS BOB

 

[Bondo]

Ayuh,.... Steam mist can occur when local weather conditions are Right,.... High humidity, possibly droppin' temps, etc,.....

Marine exhaust consists of pumpin' reasonably coolish water into the exhaust gas stream of a runnin' motor,....
The exhaust gas stream can run from several hundred degrees up to a couple Thousand degrees,....
Water boils, ei: turns to steam vapor at 212?,....

That, in itself can induce steam, into the local environment,....

Anyways,.... If in doubt, rebuild the raw water pump,....
Rubber impellers don't last forever,....